The past few years have witnessed a remarkable pro-gress of perovskite solar cells(PSCs),which can be attributed to the high light absorption coefficient,tunable bandgap,long carrier diffusion length,solution processability at low tem-perature and relatively low cost of perovskite materials.Up to now,the highest certified power conversion efficiency(PCE)of PSCs has reached 25.5％(https://www.nrel.gov/pv/cell-effi-ciency.html),shedding light on the commercialization of PSCs.Nevertheless,the stability issues of PCSs severely limit the field deployment of solar cell modules.Notably,ion migra-tion in organic-inorganic halide perovskite(OIHP)originat-ing from the ionic nature of perovskite materials has been sug-gested to be responsible for many instability problems and cannot be eliminated through encapsulation.With crucial signi-ficance being attached to the long-term durability of PSCs dur-ing operation,it is of profound implication to clarify the funda-mental mechanism and potential influence of ion migration on device performance.